The trouble started yesterday. She was very lethargic all day. She slept most of the day or else just lay on my lap. She also had diarrhea. At night she perked up a bit and eat and drank (she hadn't the rest of the day) but today when she got up she did a normal poo and wee but she's been sleeping all day again. This is really out of character for her and I was wondering if anyone could give me any advice. Basically, do you think this is something I should be concerned about?